Composition for treating boiler feed-water.



UTE S COMPOSITION FOR TREAT .1 ocean.

Specification of Letters Patent.

s ra rnncr entries.

0 LOS ANGELES, CALIFORNIA, ASSIG'NOR 'IO FERROOHEM CORPORATION OFARIZONA.

ING BOILER FEED-WATER.

Paton ted May .12, 19 M.

No Drawing. Original application filed November 28, 1910, Serial No.594,585. Divided and this application flied August 4,

"1'0 all Whom it may concern lie. it known that I, GILBERT citizen ofthe United States, residing at Los Angeles, in the county ofLos. Angelesand St ate of California, have invented a new and useful (omposition forTreating Boiler Fee(l-\Vater, of which the following is a specification.

My invention is a composition of matter which I introduce into the feedwater entering" a steam boiler and the objects of my invention are,first, to provide a composition that will prevent the formation of scaleupon the evaporative, surfaces of sueh a boiler; second, to provide acomposition that will neutralize certain of the impurities containedin'snch boiler feed water and prevent them from attacking the shell orother metal parts of such a boiler; and third, to provide a com )ositionthat will prevent the, said E. BAILEY, a

'shell 'rom being disintegrated by electrolytic action.

My composition consists'o'f a mixture of graphitic iron with from one tofour per cent. of zinc and this composition is that disclosed ,in myapplication for a United States patent on alloy and process of making,Serial 594,585, filed November 29, 1910, of which this is a division.

It is adapted to be used in the place of the expensive and bulky.chemicals generally known as boiler compounds and it maybe used in theform of a dust or powder, or lathe turnings, added direct to the waterin the boilers. It may be cast into machines or mechanical devices inwhich the boiler feed water is bro'uglrt int-o intimate contact with it,whereby the mineral matter in solution is acted upon to accomp ish theabove objects. In practice I prefer to introduce the composition intothe feed water by reducing it to small particles by abrasion. Such smallparticles may be introduced into the water by several different methodssuch as first, by providing a composition composed of graphitic iron andzinc. and providing means for feeding particles of this composition tothe water. Second, by producing an alloy of graphitic iron and zinc andthereafter providing'an abrasion whereby particles of said alloy are fedinto the feed water.

I The processes whereby the compositions used in the first methodgiven'abovc are produced are evident consisting simply of ordinarygrinding or other methods of dividing the constituent. materials, mixingin the proper proportions.

The process of producing the eompositior-i used in the second methodgiven above has been fully disclosed inmy application, Serial 594,585,of which this is a division. In the composition used in this secondmethod the ironis present an iron reasonably free from such impuritiesas sulfur, phosphorus, silicon and the like, and the IIOII lS not unitedin chemical combination withthc carhon. The carbon is largely or whollyfree and in the form of graphite the mixture be ing what is usuallycalled graphitic'iron. The zinc is a mixture or alloy with the. iron andnot a chemical combination. The composition soft, flaky and friableunder ruhhing or abrasive action.

The composition used in the second method given above is made asfollows: pig iron is selected that is as free as possible fromimpurities and that carries as high a percentage of carbon as possible.Imported Chinese pig iron and the Scotch pit! irons, rich in carbon,answer the purpose. e pig iron is melted in any foundry stack furnacesusing such fluxes as any one skilled in the art of refining iron woulduse, the main object being to produce an iron free as possible fromsulfur, arsenic, silicon, and other impurities. and yet keep the carboncontents high. When the iron is tapped furnace into the pouring ladle,from one to four per. cent. of pure metallic zinc is added according tothe way the metal will be finally used. In castings one or two per cent.of zinc is found to work well. If the composition is to be made intopowder or turned on a lathe into cent. of zinc may be added. Thecomposition should be as hot :ts possible when poured. It is importantcool slowly in the mold in order to produce ferrite. and to have thecarbon appear as flaky graphite. Especial attention must he shavings.three or four per and a suitable from the l halt the composition shouldgiven to preparing the mold and cores,

sand and iron wh'le the of sand and a heavy oil such as linseed, or

rape oil, and finished with a light coat of shellac. As both .core andsand under this treatment give off large volumes of gas l j Water thrownupon it, as, to'do so, produces cement1te" and defeats to that extentthe purpose of the composition.

I have found that the methods and compositions disclosed ab'we are quiteefficient in. accomplishing the objects previously stated herein.

I believe that to produce a successful boiler feed water purifier all ofthese objects should be accomplished and I further believe that each ofthe elements or my composition contributes to thesuccessfulaccomplishment of each object. I further believe that theaccomplishment of these objects, particularly the second, is in part atleast dependent upon certain mechanical actions in the boiler such as acolloidal or similar action which prevents the foreign matter fromcementing to form scale. I prefer, however, not to discuss the theory]involved in the action of my invent-ion contenting myself with adisclosure of the manner of making and using same in such full, clear,concise and exact terms as to enable any person skilled in the art towhich it pertains to make, construct, compound and use the same.

I claim as my invention:

A composition containing substantially pure iron, carbon in the form ofgraphite and from one to four :per cent. of zinc.

.ln testimony whereof, I have hereunto set my hand at Los Angeles,California, this 26th day of July, 1913.

GILBERT E. BAILEY.

ln presence of- FRED A. MANSFIELD, Fono W. HARRIS.

